Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4607200.

fits the ender/cr10 20x20 extrusion used to keep track of parts or estimate time left ect.. use ti to remember numbers to 3 digits do you dont need to

edit: thick number pole is longer with a thicker display arm

for a 4th digit exend pole arm length by 33%